So let me get this right, he used drugs 40+ years ago, but didn’t kill himself back then. Nor did the drugs make him kill himself in the decades since, but when he’s 68 and about to lose everything to the IRS, and fighting with his wife over it, suddenly the drugs made him do it.
You are clearly obsessed, and ready to blame anything that happens to a former drug user on the drugs. Just shows when all you have is a hammer, everything looks like a nail.
If your income is enough to run up over a quarter of a million a year in income taxes, and you make over a million in profit from selling your house, you ought to be able to cover day to day bills, unless you have a very expensive habit.